Stone-finishing machine



May 13, 1924. EAQSSES E. A. CHASE STONE FINISHING MACHINE gy @m7711413 Patented May 13, 1924.

s'roivn-nmisnine MACHINE..

i .Application filed May 26,

To all whom t may concor/t.' f

Be it known that I, ELRoY A. CHASE, ar citizen of the `United States, residing at Northfield, in the county of TWashington and State of Vermont, have invented new and useful Stone-Finishing Machines, of which tue following is a specification. i l

rlhis invention relates to a machine forl producing a finishedsurfaceon ablock `of granite or other similar material. y

It is the general object of my invention to provide an improved machine for this pur-` pose by which the finished operation may be performed with speed and economy.y

lVith this general object in View, one feature of my invention relates to theprovision of a horizontally rotatable work-supporting table, together with suitable driving mechanism therefor.

Another feature relates to the provision of device engaging the face` of the stone and pressing the saine firmly against the table as the latter is rotated. 4

ly alsol provide improved cutting devices and feeding means therefor, by which each cutter may be fed manually orautomatically as desired..

My invention further relates' to arrange`v ments and combinations of parts hereinafter described and more particularly pointedout in the appended claims. i

A preferred form of my invention is shown in the drawings, in which-,- l v Fig. 1 is a front elevation of my improved machine, certain parts being shown in section.

Fig. 2 is a sectional plan View thereof, taken along the line 2 2 in Fig. l; and

F ig. 3 is a detail sectional elevation of the feeding mechanism. j

Referring to the drawings, I have shown a work-supporting table 10, having a shaft 11 and rotatable in a horizontal plane, preferably upon ball bearings 12;

Gear teeth may be provided around the periphery of the table 10 so that the table may be rotated from a pinion 13 on adriveshaft 14, the pinion l13 being connected to the table through an idle gear 15. The stone S is supported on the table in any convenient manner and is shown herein as resting on wedges on a movable platform orcar 16 which is adapted to be rolled into position on the table with the stone S already placed thereon. This particular method of sppporting and positioning the stone is not i920. serial Massaal-i7. n

essential, however, and the stone maybe held i 1,493,519' i i' UN ED i STA-.TES f PATENT 10F ,FilC

in' a suitable chuck or may rest directly upon the table. l/Vhere. the stones are of considerabley size, however, 'the construction shown in the drawings is desirable.

I have also v provided special means forj holding 4the stone firmly against its seat von thesupport 16, such' means comprising a presser bar 20, connected to a'pston 21 in'a cylinder 22.

The cylinder is connected'. through pipes 24 and 25 to a supply of com! pressed air, steam .or other fluid by 'which'.

'pressure may be applied to eitherside of the:

piston A21 as desired'.

` When the pressure is applied to the upper side of the piston, the presser rod 20 is yieldi.

ingly 'forced downward against the' stone S and in lineV with the aXis of the table 10. The rod then holds the stone yieldingly against the table and supplements the force of gravity in preventing displacement..

A plurality of cutters 26 are-mountedl for free rotation' on short shafts 2,7 leach having an inclined bearing 28 carried by across slide 29. The slides I29" areniounted: on

guides30, secured to a frame 31 mounted Vtol 7"' slide vertically between corner posts Adiusting screws '33V arevprovided at each corner ofthe frame for raising and lower-` ing'f'the same.' Thesefscrewsare connected to rotate together by means of a series -of bevel gears 34 and cross shafts 35. One of the cross shafts vmay "be provided with I `driving pulley 36 Aby whichthe frame may .be raised and lowered by power and a han' dle 37`may be provided for hand adjustment.

Gross feed screws40 are provided for the,vv cross slides-29, the feed screws'havin'gV bear" ings in the frame 31 and being held from longitudinal movement by collars 41 and 42 (rige). A hand when ii is keyed to @zich feed screw 40 but is slidable thereon, and

, each hand wheel has a bevel gear 45 vmounted to rotate therewith.k

of a short Vshaft 47 rotatab-le in a bearing (Fig.` 2), driven fro-m a'sprocket 51 suitably connected to the driving mechanism.

A latch 52 (Fig. 3) is mounted to slide radially on each hand wheel 44 and in one -position engages a groove 53 formednear .Q .v.. i

the end of the cross feed screw 40. Wheny y 10o A bevel pinion 46 is fixed to the lower end the latch is in the groove 53, the bevel gear l5 meshes with the bevel pinion 46 and is rotated thereby. Means is thus provided for simultaneously rotating all of the feed screws and for thus simultaneously advancing all of the cutters 26; These cutters may be adjusted so that they all work together in making a single cut over the face of the stone, or they may be adjusted in four slightly separated planes so that they will remove successive layers of material from the stone. Adjustment for this purpose is provided between the bearings 28 and the cross slides 29.

By withdrawing the latch 52 andA sliding the hand wheel Liet and gear 45 outward on the 'feed screw 40, the corresponding cutter may bemoved manually to any desired posivthe operati-on should be apparent.

tion, after which the ieed is thrown in by` pushing the hand wheel and bevel gear back to latched position.

Having thus fully described my invention, The stone S is adjusted in position on the support 16 by wedges or in any other conveiiient manner and is then moved to a central position on the table l0. The presser bar 20 is lowered to engage the stone along the line of the axis of the table and the table is then rotated through the gear train previously described. n An anti-friction connection 54: between the upper and lower parts of the piston rod 20 permits the lower end to rotate freely with the stone.

The several cutters 26 are adjusted vertically and horizontally to their proper relative positions and are then advanced simultaneously toward the center by the operation of the drive chain 50.

By the use of this machine the time required to iinish a block of stone of a given size is very greatly reduced while, at the same time, superior work is produced.

From this description of my invention, it will be evident that changes and modifications can be made therein by those skilled in the art within the spirit and scope of my invention as set forth in the claims and do not wish to be otherwise limited to the details herein disclosed, but what I claim is l. stone finishing machine having, in combination, a work support mounted to rotate in a horizontal plane, means to rotate said support, a plurality of cross slides, radially spaced guide-ways for said cross slides, a stone cutting tool mounted on each cross slide, means to move each cross slide manually toward and from the axis of said support, and means to move each cross slide automatically toward and 'from the axis o said support, said manual means and said automatic means being alternately appli- `cable to any selected cross slide entirely separate from the operation of all of ther ing means for said slides, and independent devices to connect said feeding means to any i selected cross slide separately. n

3. A stone finishing machine having, in combination, a work support mounted to rotate in a horizontal plane, means to rotate said support, a plurality of cutting devices mounted for movement along different angularly disposed axial paths across the face of said support, means to feed said cutting devices toward and from the axis of said` support, and means to vertically adjust all of said cutting devices and the feeding means collectively as a single unit to cause said devicesV to remove successive thin layers of material, from the upper face oi the work.

In'k testimony y whereof I have hereunto aiiixed my signature.

Ensor A. CHASE. 

